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Equity-accounted Investments - Condensed Summary of Company's Investments in and Advances to Joint Ventures (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 11, 2017
Nov. 30, 2011
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 100.00%      
Investments in subsidiaries $ 1,288,444 $ 1,335,123    
Minimum        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 14.00%      
Maximum        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 52.00%      
Yamal LNG Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 50.00%   50.00%  
Magnora        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest   43.50%   40.00%
Other        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 50.00%      
Investments in subsidiaries $ 0 $ 1,169    
Teekay Parent        
Schedule of Equity Method Investments [Line Items]        
Investments in subsidiaries $ 488,547 1,117,291    
Teekay Parent | Magnora | Offshore Production | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 44.00%      
Investments in subsidiaries $ 0 15,589    
Teekay Parent | Teekay Offshore | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 14.00%      
Investments in subsidiaries $ 157,924 208,871    
Teekay Parent | TOO GP | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 49.00%      
Investments in subsidiaries $ 3,968 4,061    
Teekay LNG | Bahrain LNG Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Investments in subsidiaries $ 79,100 79,100    
Teekay LNG | Bahrain LNG Joint Venture | Liquefied Gas Carriers | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 30.00%      
Investments in subsidiaries $ 81,709 77,786    
Teekay LNG | Yamal LNG Joint Venture | Liquefied Gas Carriers | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 50.00%      
Investments in subsidiaries $ 210,290 194,715    
Teekay LNG | Pan Union Joint Venture | Liquefied Gas Carriers | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Investments in subsidiaries $ 71,040 38,298    
Teekay LNG | Pan Union Joint Venture | Minimum | Liquefied Gas Carriers | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 20.00%      
Teekay LNG | Pan Union Joint Venture | Maximum | Liquefied Gas Carriers | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 30.00%      
Teekay LNG | Exmar LNG Joint Venture | Liquefied Gas Carriers | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 49.00%      
Investments in subsidiaries $ 32,419 79,915    
Teekay LNG | Exmar LPG Joint Venture | Liquefied Gas Carriers | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 50.00%      
Investments in subsidiaries $ 151,186 157,926    
Teekay LNG | Teekay LNG - Marubeni Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 52.00%      
Teekay LNG | Teekay LNG - Marubeni Joint Venture | Liquefied Gas Carriers | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 52.00%      
Investments in subsidiaries $ 342,280 335,897    
Teekay LNG | Angola LNG Carriers | Liquefied Gas Carriers | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 33.00%      
Investments in subsidiaries $ 79,606 73,316    
Teekay LNG | RasGas3 Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 40.00%      
Teekay LNG | RasGas3 Joint Venture | Liquefied Gas Carriers | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 40.00%      
Investments in subsidiaries $ 132,256 123,034    
Teekay Tankers | Wah Kwong Joint Venture | Conventional Tankers | Operating Segments        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 50.00%      
Investments in subsidiaries $ 25,766 $ 24,546    
Qatar Gas Transport Company Ltd | RasGas3 Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership interest 60.00%